Explanation:

- Mining (Option 1):

- Mining involves extracting natural resources from the earth.

- It is considered a primary activity, not an auxiliary to trade.

- It provides raw materials for various industries.

- Mining is the correct answer, as it is not an auxiliary to trade.

- Insurance (Option 2):

- Insurance helps mitigate financial risks associated with trade.

- It provides security and reduces uncertainties for businesses.

- It supports commercial transactions and business operations.

- Warehousing (Option 3):

- Warehousing provides storage for goods before distribution.

- It ensures the availability of goods when required.

- It is a crucial link in the supply chain.

- Transport (Option 4):

- Transport is essential for moving goods from one place to another.

- It facilitates the physical distribution of products.

- It supports trade by connecting markets and consumers.